Use py3 for apex_sepolicy_tests_test

It fails in the build/test server due to `match` usage.

Bug: 277586190
Test: atest apex_sepolicy_tests_test
Change-Id: I34c90bae0f555042c8a4cc9308e9b7e1885d3b72
diff --git a/tests/Android.bp b/tests/Android.bp
index 719f9a0..cc0bdc1 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -100,6 +100,11 @@
     test_options: {
         unit_test: true,
     },
+    version: {
+        py3: {
+            embedded_launcher: true,
+        },
+    },
 }
 
 python_binary_host {